#66C531
Closest named color: Apple (#6ECB3C). oklch(73.7% 0.201 136.9), rgb(102, 197, 49).
Aa
Black text reads best on this color (9.59:1).
About this color
#66C531 is a medium-light, vivid green. In OKLCH its lightness is 74%, its chroma 0.201 and its hue 137°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Apple (#6ECB3C), ΔE 0.020 away. Black text reads best on it, at 9.59:1.
| Hue family | Greens |
| Lightness | medium-light (74%) |
| Chroma | vivid (0.201) |
| Temperature | in between |
| Nearest name | Apple (#6ECB3C) |
| Black text | 9.59:1 |
| White text | 2.18:1 |
Values
| HEX | #66C531 |
| RGB | rgb(102, 197, 49) |
| HSL | hsl(99, 60%, 48%) |
| OKLCH | oklch(73.7% 0.201 136.9) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #66C531 | 2.18:1 | Fails | Lc -47.4 | Large or bold text, headings |
| Black text on #66C531 | 9.59:1 | AAA | Lc 61.2 | Content text, not long reading |
| #66C531 text on white | 2.18:1 | Fails | Lc 42.7 | Non-text elements, placeholder text |
| #66C531 text on black | 9.59:1 | AAA | Lc -59.5 | Large or bold text, headings |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 400.
-
Step 50
50
#F0F8ED
oklch(97% 0.017 137)
-
Step 100
100
#DFF0D8
oklch(93.6% 0.037 136.4)
-
Step 200
200
#C4E4B7
oklch(88.4% 0.069 136.7)
-
Step 300
300
#9AD382
oklch(80.8% 0.124 136.8)
-
Step 400
400 (this color)
#66C531
oklch(73.7% 0.201 136.9)
-
Step 500
500
#49A200
oklch(63.2% 0.191 136.9)
-
Step 600
600
#3C8800
oklch(55.6% 0.168 136.9)
-
Step 700
700
#317200
oklch(49% 0.148 136.9)
-
Step 800
800
#275E00
oklch(42.7% 0.129 137)
-
Step 900
900
#204E00
oklch(37.6% 0.113 136.7)
-
Step 950
950
#102F00
oklch(27.1% 0.082 137)
#66C531 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #CCB40F | 0.126 |
| Deuteranopia (no green cones) | #BFAC41 | 0.127 |
| Tritanopia (no blue cones) | #61BEA9 | 0.142 |
| Achromatopsia (no color) | #AFAFAF | 0.201 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66C531
#66C531
oklch(73.7% 0.201 136.9)
- #DB7BFC
#DB7BFC
oklch(73.7% 0.201 316.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #66C531, closest first.
No curated palette has a color within ΔE 0.04 of #66C531.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Apple #6ECB3C ΔE 0.020
- Dark Lime Green #7EBD01 ΔE 0.028
- Apple Green #76CD26 ΔE 0.029
- Frog Green #58BC08 ΔE 0.032
- Lime Green #32CD32 ΔE 0.036
- Dark Lime #84B701 ΔE 0.042
- Leafy Green #51B73B ΔE 0.047
- Shamrock Green #02C14D ΔE 0.049
Use #66C531 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.